UIVIiew and animation

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self initButton];
    }

-(void)initView{
    for (int i=0; i < 4; i ++ ) {
        UIView * view = [[UIView alloc]initWithFrame:CGRectMake(30+((self.view.frame.size.width-150)/4+30)*i, 500, (self.view.frame.size.width-150)/4, (self.view.frame.size.width-150)/4)];
        view.backgroundColor =[UIColor redColor];
        view.layer.cornerRadius = (self.view.frame.size.width-150)/4/2;
        [UIView animateWithDuration:4 delay:1 usingSpringWithDamping:0.01 initialSpringVelocity:0.1 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
            view.transform = CGAffineTransformMakeScale(1.0 , 1.0);
            view.center = CGPointMake(30+((self.view.frame.size.width-150)/4+30)*i, 800);
        } completion:^(BOOL finished){
            view.center = CGPointMake(30+((self.view.frame.size.width-150)/4+30)*i, 800);
        }];
        
        [self.view addSubview:view];
    }
}
//duration动画持续时间
//delay动画延时几秒执行
//velocity动画开始速度
//options动画效果参数options:UIViewAnimationOptionBeginFromCurrentState
//completion动画执行完成的回调
//usingSpringWithDamping:0.01范围0.01-1。0取值越小，弹性越明显



-(void)initButton{
    UIButton * button = [[UIButton alloc]initWithFrame:CGRectMake(self.view.frame.size.width/2 - 25, self.view.frame.size.height-50, 50, 50)];
    button.backgroundColor =[UIColor redColor];
    [button addTarget:self action:@selector(initView) forControlEvents:UIControlEventTouchDown ];
        NSLog(@"%d",1);
    [self.view addSubview:button];
}

optiona后面所接的选择

enum {
   UIViewAnimationOptionLayoutSubviews            = 1 <<  0,
   UIViewAnimationOptionAllowUserInteraction      = 1 <<  1,
   UIViewAnimationOptionBeginFromCurrentState     = 1 <<  2,
   UIViewAnimationOptionRepeat                    = 1 <<  3,
   UIViewAnimationOptionAutoreverse               = 1 <<  4,
   UIViewAnimationOptionOverrideInheritedDuration = 1 <<  5,
   UIViewAnimationOptionOverrideInheritedCurve    = 1 <<  6,
   UIViewAnimationOptionAllowAnimatedContent      = 1 <<  7,
   UIViewAnimationOptionShowHideTransitionViews   = 1 <<  8,
   UIViewAnimationOptionOverrideInheritedOptions  = 1 <<  9,
    
   UIViewAnimationOptionCurveEaseInOut            = 0 << 16,
   UIViewAnimationOptionCurveEaseIn               = 1 << 16,
   UIViewAnimationOptionCurveEaseOut              = 2 << 16,
   UIViewAnimationOptionCurveLinear               = 3 << 16,
    
   UIViewAnimationOptionTransitionNone            = 0 << 20,
   UIViewAnimationOptionTransitionFlipFromLeft    = 1 << 20,
   UIViewAnimationOptionTransitionFlipFromRight   = 2 << 20,
   UIViewAnimationOptionTransitionCurlUp          = 3 << 20,
   UIViewAnimationOptionTransitionCurlDown        = 4 << 20,
   UIViewAnimationOptionTransitionCrossDissolve   = 5 << 20,
   UIViewAnimationOptionTransitionFlipFromTop     = 6 << 20,
   UIViewAnimationOptionTransitionFlipFromBottom  = 7 << 20,
};

关于 view.transform = CGAffineTransformMakeScale(1.0 , 1.0);

1.CGAffineTransformMakeScale (CGFloat sx, CGFloat sy);//创建一个给定比例放缩的变换，那么图片的宽度就会变为  width*sx  ，对应高度变为  hight * sy。

2.CGAffineTransform CGAffineTransformMakeRotation ( CGFloat angle); //创建一个旋转角度的变化在这里可以看到参数并不是一个角度，但是它是把参数作为一个弧度，然后把弧度再转换为角度来处理，其结果就可能是将一个图片视图旋转了多少度。

3。CGAffineTransform CGAffineTransformMakeTranslation (CGFloat tx,CGFloat ty);这个就比较好理解了，假设是一个视图，那么它的起始位置 x 会加上tx , y 会加上 ty